Firstly, let me apologise for not doing ...
"Please try to include photos to show all parts of the fungus, eg top, stem, and gills.
Note any smells, and associated trees or plants (eg oak, birch). A spore print can be very useful."

I was just out for a walk on Saturday and saw this and wondered what it was ...

What I can say is that I was on a west facing hillside along the side of a field in Cambridgeshire. There were several of them, up to 8 inches tall, The picture is of one of the most magnificent

Welcome to UKFungi Anna
This is one of the horsetails which has separate fertile and vegetative (photosynthetic) stems. I think this could well be Equisetum telmateia, Great Horsetail; a rather splendid plant in full growth - worth a visit later in the year. See:http://www.freenatureimages.eu/plants/F ... index.html